| 摘要 |
PURPOSE:To improve the welding speed and to improve reliability of a joint by performing secondary bead welding so that a part of a primary bead is melted and the rest is left unmelted. CONSTITUTION:An upper sheet and a lower sheet of the galvanized steel sheets are welded together by arc welding. After the primary bead is formed, secondary bead welding where a part of the primary bead is melted and the rest is unmelted is performed. Namely, in order to attain the welding method where defects are not caused in the bead formed by arc welding, to prevent zinc existing in the periphery of the bead from gasifying by welding heat and penetrating into a molten pool, after the primary bead is formed, secondary bead welding where a part of the primary bead is melted and the rest is unmelted is performed, by which pits and blowholes generated in the bead can be improved remarkably. Consequently, the occurrence of the blowholes at the time of arc welding of the galvanized steel sheets can be obviated. |
